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T Motoki

    Applied Optics
    |February 4, 2010
    PubMed
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    A novel optical modulator utilizing electrooptic crystals in a mosaic structure offers low voltage operation and temperature insensitivity. This design, using square phase gratings, achieves 100% modulation at 68V, a significant improvement over conventional devices.

    Area of Science:

    • Optoelectronics
    • Materials Science

    Background:

    • Conventional optical modulators often require high operating voltages.
    • Electrooptic crystals like Lithium Niobate (LiNbO3) are key components in modulator technology.

    Purpose of the Study:

    • To propose and experimentally validate a novel optical modulator design.
    • To demonstrate the feasibility of fabricating modulators using a mosaic structure of electrooptic crystals.
    • To evaluate the performance characteristics of the proposed modulator, focusing on voltage requirements and stability.

    Main Methods:

    • Theoretical analysis and experimental fabrication of an optical modulator.
    • Utilizing a mosaic structure of eight 0.9(z) x 0.9(y) x 12.5(x)-mm LiNbO3 rods to create square phase gratings.
    • Characterizing the device's modulation voltage, capacitance, modulation transfer function, and angle of diffraction.

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    Main Results:

    • The experimental device achieved 100% modulation at 68 V with a capacitance of 18 pF.
    • Experimental results for modulation transfer function and diffraction angle closely matched theoretical analysis.
    • The proposed modulator demonstrated approximately 40% lower operating voltage compared to conventional LiNbO3 modulators.
    • The device exhibited insensitivity to temperature changes.

    Conclusions:

    • The proposed optical modulator design, based on a mosaic structure of electrooptic crystals, is effective and feasible for fabrication.
    • This design offers significant advantages, including reduced operating voltage and enhanced temperature stability.
    • The findings suggest a promising alternative for developing more efficient and robust optical modulation technologies.